Smith & Wesson revolver experts step in please

[HFS]

Made 1948-1951. Pre- model 10.

I couldn't remember the years but it's got the upswept hammer spur of that era (don't remember what collectors call it).

 

[Mr.Glock]

48-52.

 

[Mr.Glock]

Here is one of my 1953s.

 

[Rolando]

humpback hammer
https://xavierthoughts.blogspot.com/2007/12/humpback-hammers.html